Abstract
A previously derived theoretical compressive strength for fibres composed of uniaxially oriented and extended polymer chains was compared with the measured strengths of several high performance fibres. For failure initiated by elastic microbuckling of polymer chains or fibrils, the maximum fibre strength is predicted to be equal to the minimum longitudinal shear modulus of the fibre. An excellent linear correlation between measured strengths and torsion moduli was obtained for four liquid-crystalline polymer fibres and high modulus graphite fibres. The correlation shows that measured strengths are 30% of the corresponding torsion moduli for all these fibres. A high modulus, high strength polyethylene fibre exhibited a compressive strength-torsion modulus ratio that was lower than the value 0.3 obtained for the other fibres examined in this study.
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Deteresa, S.J., Porter, R.S. & Farris, R.J. Experimental verification of a microbuckling model for the axial compressive failure of high performance polymer fibres. J Mater Sci 23, 1886–1894 (1988). https://doi.org/10.1007/BF01115735
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DOI: https://doi.org/10.1007/BF01115735